X-ray imaging device, high voltage generation device, and switching device

Abstract

This X-ray imaging device (100) comprises a switching unit (7) that switches an output destination of electric power. The switching unit (7) includes a holding member (30), an electrode movement unit (50), and a biasing member (60) that biases a switching movable electrode (40) so as to maintain a first state in which the switching movable electrode (40) and a first switching fixed electrode (41) are in contact with each other and to maintain a second state in which the switching movable electrode (40) and a second switching fixed electrode (42) are in contact with each other, the switching unit configured so as to cut off energization to the electrode movement unit (50) in the first state and the second state.

Description

X-ray imaging apparatus, high-voltage generator, and switching device

[0001] The present invention relates to an X-ray imaging apparatus, a high-voltage generator, and a switching device.

[0002] Conventionally, a switching device is known. Such a switching device is disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-288457.

[0003] Japanese Patent Application Laid-Open No. 2004-288457 discloses a high-voltage switch (switching unit, switching device). The high-voltage switch is used in an X-ray power supply device (a high-voltage generator provided in an X-ray imaging apparatus) or the like. The high-voltage switch is configured to switch a circuit by separating a movable contact from one fixed contact and bringing it into contact with the other fixed contact by the operation of a solenoid. When power is applied to the solenoid, the actuator moves against the biasing force of the coil spring and the movable contact shaft rotates counterclockwise, so that the movable contact separates from one fixed contact and contacts the other fixed contact. When the movable contact contacts the other fixed contact, the circuit is switched from the first circuit to the second circuit. Also, when the power to the solenoid is cut off, the actuator is released and moves by the biasing force of the coil spring, and the movable contact shaft rotates clockwise, so that the movable contact separates from the other fixed contact and contacts one fixed contact. When the movable contact contacts one fixed contact, the circuit is switched from the second circuit to the first circuit.

[0004] Japanese Patent Application Laid-Open No. 2004-288457

[0005] However, in the high-voltage switch (switching unit) disclosed in Japanese Patent Application Laid-Open No. 2004-288457, a device that operates by the second circuit switched by applying power to the solenoid can be operated while power is applied to the solenoid. That is, in the state where the circuit is switched to the second circuit, when the power to the solenoid is cut off, the circuit is switched to the first circuit. Therefore, in order to continuously operate the device that operates by the second circuit, it is necessary to keep the solenoid energized. Therefore, power saving for maintaining the state in which the device in the switching unit is switched is desired.

[0006] This invention was made to solve the above-mentioned problems, and one of its objectives is to provide an X-ray imaging apparatus, a high-voltage generator, and a switching device that can reduce the power consumption required to maintain the switched state of equipment in the switching section.

[0007] X-ray imaging apparatus comprising a first imaging unit including a first X-ray tube, a second imaging unit including a second X-ray tube, and a switching unit for switching the power output destination between the first X-ray tube and the second X-ray tube, wherein the switching unit includes a holding member for holding a switching movable electrode, an electrode moving unit for moving the holding member by applying current to move the switching movable electrode, a first switching fixed electrode for electrically connecting the first X-ray tube and the power supply by contacting the switching movable electrode, a second switching fixed electrode for electrically connecting the second X-ray tube and the power supply by contacting the switching movable electrode, and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintaining a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is cut off in the first and second states. A high-voltage generator comprising: a transformer that increases the voltage of input power and outputs the increased power to either a first device or a second device; and a switching unit that switches the output destination of the power output from the transformer between the first device and the second device, wherein the switching unit includes a holding member that holds a switching movable electrode; an electrode moving unit that moves the switching movable electrode by moving the holding member when current is applied; a first switching fixed electrode that electrically connects the first device and the transformer by contacting the switching movable electrode; a second switching fixed electrode that electrically connects the second device and the transformer by contacting the switching movable electrode; and a biasing member that biases the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintains a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is cut off in the first and second states.A switching device for switching the output destination of input power between a first device and a second device, comprising: a holding member for holding a switching movable electrode; an electrode moving part for moving the holding member by energizing; a first switching fixed electrode for electrically connecting the first device and a power source by contacting the switching movable electrode; a second switching fixed electrode for electrically connecting the second device and a power source by contacting the switching movable electrode; and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintaining a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the device is configured such that the current to the electrode moving part is cut off in the first and second states.

[0008] In the above-described X-ray imaging apparatus, high-voltage generator, and switching device, as described above, the biasing member maintains the first state in which the switching movable electrode and the first switching fixed electrode are in contact, and also maintains the second state in which the switching movable electrode and the second switching fixed electrode are in contact. In other words, in both the first and second states, the biasing member can maintain the first and second states without continuously supplying power to the electrode moving part. Therefore, the power supply to the electrode moving part can be cut off in the first and second states. As a result, power consumption required to maintain the switched state of the equipment in the switching part (switching device) can be reduced.

[0009] This is a schematic diagram showing the overall configuration of the X-ray imaging apparatus in the first embodiment. This is a schematic circuit diagram of the X-ray imaging apparatus in the first embodiment. This is a schematic diagram showing an example of a switching unit in the first embodiment. This is a schematic diagram showing an example of a holding member and a biasing member in the first embodiment. This is a schematic diagram showing an example of a first outflow obstructing member and a second outflow obstructing member. This is a schematic diagram showing an example of a connecting support member. This is a perspective view of the switching unit from a first direction. This is a perspective view of the switching unit from a second direction. This is a schematic diagram for explaining the switching from the second X-ray tube to the first X-ray tube by the switching unit. This is a schematic diagram for explaining the switching from the first X-ray tube to the second X-ray tube by the switching unit. This is an example of a timing chart for switching between the first X-ray tube and the second X-ray tube by the switching unit. This is a schematic diagram showing an example of a switching unit in the second embodiment. This is a schematic diagram showing an example of a holding member in the second embodiment. This is a schematic diagram showing an example of a holding member and a movable electrode for switching. This is a schematic diagram showing the movable electrode and the first fixed electrode for switching in the first state, and the movable electrode and the second fixed electrode for switching in the second state. This is a schematic diagram showing an example of the first stopper and the first fixed electrode for switching. This is a schematic diagram showing an example of the first stopper.

[0010] Hereinafter, embodiments embodying the present invention will be described based on the drawings.

[0011] [First Embodiment] An X-ray imaging apparatus 100 according to the first embodiment will be described with reference to Figures 1 and 2.

[0012] (Overall configuration of the X-ray imaging apparatus) As shown in Figure 1, the X-ray imaging apparatus 100 comprises a first imaging unit 1, a second imaging unit 2, a high-voltage generator 3, an operation unit 4, and a control unit 5. The first imaging unit 1 and the second imaging unit 2 are located in the examination room 91. The high-voltage generator 3, the operation unit 4, and the control unit 5 are located in an operation room 92 adjacent to the examination room 91. The high-voltage generator 3, the operation unit 4, and the control unit 5 may also be located in the examination room 91.

[0013] The first imaging unit 1 includes a first X-ray tube 10, a first detector 11, and a first detector holder 12. The first imaging unit 1 is configured to perform imaging with the subject 90 in an upright position. The first X-ray tube 10 is an example of the "first device" in the claims.

[0014] The first X-ray tube 10 is configured to irradiate the first detector 11 with X-rays. The first X-ray tube 10 is connected to a high-voltage generator 3 (see Figure 2). The first X-ray tube 10 is configured to generate X-rays when a high voltage is applied to it.

[0015] The first detector 11 is configured to detect X-rays emitted from the first X-ray tube 10. The X-rays emitted from the first X-ray tube 10 pass through the subject 90 and are incident on the detection surface of the first detector 11. The first detector 11 is configured to convert the detected X-rays into an electrical signal. This allows for the acquisition of an X-ray image that reflects the transmission of X-rays through the subject 90. The first detector 11 is, for example, an FPD (Flat Panel Detector).

[0016] The first detector holder 12 holds the first detector 11. The first detector holder 12 holds the first detector 11 so that it can move vertically according to the imaging area of ​​the subject 90 and the height of the subject 90.

[0017] The second imaging unit 2 includes a top plate 22, a second X-ray tube 20, and a second detector 21. The second imaging unit 2 is configured to perform imaging with the subject 90 lying down (supine position). The second X-ray tube 20 is an example of the "second device" in the claims.

[0018] The top plate 22 is on which the subject 90 is placed. The top plate 22 has a front surface on which the subject 90 is placed, and a back surface on the opposite side of the front surface. The top plate 22 is configured to be able to move up and down in the vertical direction by a top plate moving mechanism (not shown). The top plate 22 is also configured to be able to slide in the longitudinal and transverse directions by a top plate moving mechanism (not shown).

[0019] The second X-ray tube 20 is configured to irradiate the second detector 21 with X-rays. The second X-ray tube 20 is connected to a high-voltage generator 3 (see Figure 2). The second X-ray tube 20 is configured to generate X-rays when a high voltage is applied to it. The second X-ray tube 20 is located on the underside of the top plate 22.

[0020] The second detector 21 is configured to detect X-rays emitted from the second X-ray tube 20. The X-rays emitted from the second X-ray tube 20 pass through the subject 90 and enter the detection surface of the second detector 21. The second detector 21 is configured to convert the detected X-rays into an electrical signal. This allows for the acquisition of an X-ray image that reflects the transmission of X-rays through the subject 90. The second detector 21 is, for example, an FPD (Flat Panel Detector). The second detector 21 is located on the surface side of the top plate 22.

[0021] The second X-ray tube 20 and the second detector 21 are positioned facing each other with the top plate 22 in between. The second X-ray tube 20 and the second detector 21 are configured to move integrally in a straight line in the longitudinal and transverse directions of the top plate 22 while maintaining their opposing position, by means of an imaging unit movement mechanism (not shown). In other words, the second X-ray tube 20 and the second detector 21 are configured to move relative to the top plate 22.

[0022] The high-voltage generator 3 is configured to supply high voltage to the first X-ray tube 10 and the second X-ray tube 20. The high-voltage generator 3 (see Figure 2) is configured to convert AC power input from a commercial power source (not shown) via an AC / DC converter and inverter into DC high voltage, and to output the boosted power to the first X-ray tube 10 and the second X-ray tube 20. Further details of the high-voltage generator 3 will be described later.

[0023] The control unit 4 receives input operations for operating the X-ray imaging apparatus 100. For example, the control unit 4 receives user operations to select between imaging by the first imaging unit 1 and imaging by the second imaging unit 2. The control unit 4 includes, for example, a touch panel.

[0024] The control unit 5 is configured to control each part of the X-ray imaging apparatus 100. The control unit 5 is a computer that includes a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). The control unit 5 controls each part of the X-ray imaging apparatus 100 by having the CPU execute a predetermined control program. The control unit 5 is also configured to control the operation of each part of the X-ray imaging apparatus 100 based on input operations received by the operation unit 4. As an example, the control unit 5 is configured to control the high-voltage generator 3 based on an operation received by the operation unit 4 to select between imaging by the first imaging unit 1 and imaging by the second imaging unit 2. Furthermore, the control unit 5 is configured to confirm that the selection signals of the first imaging unit 1 and the second imaging unit 2 match the detection state of the contact signal of the cutoff movable electrode 71. Details of the confirmation by the control unit 5 will be described later.

[0025] (Configuration of the high-voltage generator) As shown in Figure 2, the high-voltage generator 3 includes a transformer 6 and a switching unit 7. Figure 2 is a schematic circuit diagram of the X-ray imaging apparatus 100 when imaging using the first imaging unit 1, which includes the first X-ray tube 10, is selected. The switching unit 7 is an example of a "switching device" within the scope of the claims.

[0026] The transformer 6 is configured to boost the AC power input from a commercial power source (not shown) via an AC / DC converter and inverter, and to convert it into DC power. The transformer 6 is configured to boost the power to a potential difference of tens of thousands to hundreds of thousands of volts. The transformer 6 is configured to output the boosted power to either the first device or the second device. In the first embodiment, the transformer 6 is configured to output the boosted power to either the first X-ray tube 10 or the second X-ray tube 20.

[0027] The switching unit 7 is configured to switch the output destination of the power output from the transformer 6 between the first X-ray tube 10 and the second X-ray tube 20. When imaging by the first imaging unit 1 is selected, and the operation unit 4 receives an operation to select imaging by the second imaging unit 2, the switching unit 7 switches the output destination of the power output from the transformer 6 to the second X-ray tube 20. When imaging by the first imaging unit 1 is selected, and the operation unit 4 receives an operation to select imaging by the first imaging unit 1, the switching unit 7 keeps the output destination of the power output from the transformer 6 to the first X-ray tube 10.

[0028] Furthermore, if imaging by the second imaging unit 2 is selected, and the operation unit 4 receives a request to select imaging by the first imaging unit 1, the switching unit 7 switches the output destination of the power output from the transformer 6 to the first X-ray tube 10. If imaging by the second imaging unit 2 is selected, and the operation unit 4 receives a request to select imaging by the second imaging unit 2, the switching unit 7 leaves the output destination of the power output from the transformer 6 as the second X-ray tube 20.

[0029] (Configuration of the switching section) The switching section 7 will be described with reference to Figures 3, 4(a), and 4(b). As shown in Figure 3, the switching section 7 includes a holding member 30, a movable electrode 40 for switching, a fixed electrode 41 for first switching, a fixed electrode 42 for second switching, an electrode moving section 50, a biasing member 60, and a current interruption section 70. The switching section 7 is housed inside the housing 8. The switching section 7 is arranged inside the housing 8 and covered with insulating oil 9.

[0030] Figure 3 is a schematic diagram of the switching unit 7 when imaging by the first imaging unit 1, including the first X-ray tube 10, is selected. In the examples shown in Figures 3 to 10, the vertical direction is defined as the Z direction, with the upward direction being the Z1 direction and the downward direction being the Z2 direction. In addition, two mutually orthogonal directions within the horizontal plane perpendicular to the Z direction are defined as the X direction and the Y direction. Of the X directions, one side is defined as the X1 direction and the other side as the X2 direction. Similarly, of the Y directions, one side is defined as the Y1 direction and the other side as the Y2 direction.

[0031] Figure 4(a) is a schematic diagram of the retaining member 30 and biasing member 60 in a state where the switching movable electrode 40 does not contact either the first switching fixed electrode 41 or the second switching fixed electrode 42, and the retaining member 30 is positioned approximately along the Z direction. Figure 4(b) is a schematic diagram of the retaining member 30 located in the X1 direction as seen from the X2 direction side of the retaining member 30 in Figure 4(a). Note that, for convenience, the illustration of the resistance member 34, which will be described later, is omitted in Figures 3, 4(a), and 4(b).

[0032] As shown in Figure 3, the holding member 30 is configured to hold the switching movable electrode 40. The holding member 30 holds the switching movable electrode 40 at the end side in the Z2 direction. The holding member 30 includes a first holding member 30a (see Figure 4(b)) provided on the Y1 direction side, a second holding member 30b (see Figure 4(b)) provided on the Y2 direction side, and a switching movable electrode holding member 30c (see Figure 4(b)). The first holding member 30a, the second holding member 30b, and the switching movable electrode holding member 30c are formed by integral molding. Note that the first holding member 30a, the second holding member 30b, and the switching movable electrode holding member 30c may be formed as separate parts from each other.

[0033] The retaining member 30 is supported by the electrode moving part 50. The retaining member 30 is supported by the connecting support member 51 of the electrode moving part 50 at its end in the Z1 direction. Specifically, the second retaining member 30b (see Figure 4(b)) is supported by the connecting support member 51 of the electrode moving part 50 at its end in the Z1 direction. The second retaining member 30b has a through hole 31 (see Figure 6(b)) formed at its end in the Z1 direction, and is supported by the electrode moving part 50 by the support member 511 (see Figure 6(b)) of the connecting support member 51 passing through the through hole 30. The retaining member 30 is made of resin.

[0034] The holding member 30 is provided with a pivot point 32. The holding member 30 is supported so as to be rotatable by the pivot point 32. Specifically, as shown in Figure 4(b), the holding member 30 is supported so as to be rotatable by a first pivot point 32a provided on the first holding member 30a and a second pivot point 32b provided on the second holding member 30b. The first pivot point 32a is provided on the first holding member 30a between the switching movable electrode 40 and the blocking movable electrode 71 formed on the Z1 direction side. The second pivot point 32b is provided on the second holding member 30b between the switching movable electrode 40 and a through hole 31 (see Figure 6(b)) formed at the end in the Z1 direction. The holding member 30 is configured to rotate around the pivot point 32 as the axis of rotation. Specifically, the first retaining member 30a and the second retaining member 30b of the retaining member 30 are configured to rotate integrally with the first pivot point 32a and the second pivot point 32b as pivot axes.

[0035] The switching movable electrode holding member 30c is connected to the Z2 direction end of the first holding member 30a and the Z2 direction end of the second holding member 30b, and is provided to extend in the Y direction. The switching movable electrode holding member 30c is provided with a switching movable electrode 40 (high voltage anode input terminal 400 and high voltage cathode input terminal 401). The switching movable electrode holding member 30c is also configured to rotate and move integrally with the first holding member 30a and the second holding member 30b.

[0036] As shown in Figure 3, the switching movable electrode 40 is held by the holding member 30 at the Z2 end of the holding member 30. Specifically, the switching movable electrode 40 is held by the switching movable electrode holding member 30c (see Figure 4(b)). The switching movable electrode 40 is configured to rotate in conjunction with the rotational movement of the holding member 30, with the pivot point 32 as the pivot point. As shown in Figure 2, the switching movable electrode 40 includes a high-voltage anode input terminal 400 and high-voltage cathode input terminals 401. In the first embodiment, the switching movable electrode 40 includes, as an example, one high-voltage anode input terminal 400 and three high-voltage cathode input terminals 401. The three high-voltage cathode input terminals 401 are the electrode 402 for the large-focus filament, the electrode 403 for the small-focus filament, and the common electrode 404. As shown in Figure 7, one high-voltage anode input terminal 400 is provided on the Y2 end of the holding member 30. In addition, three high-voltage cathode input terminals 401 are provided on the Y1 end of the holding member 30. The high-voltage anode input terminal 400 and the high-voltage cathode input terminals 401 are spaced apart from each other because the potential difference between them is large. Each of the three high-voltage cathode input terminals 401 is placed close to each other because the potential difference between them is small. The number of switching movable electrodes 40 is not particularly limited.

[0037] As shown in Figure 3, the first fixed switching electrode 41 is configured to electrically connect the first X-ray tube 10 and the transformer 6 by contacting the movable switching electrode 40. The first fixed switching electrode 41 and the second fixed switching electrode 42 are fixedly arranged facing each other with the movable switching electrode 40 in between. As shown in Figure 2, the first fixed switching electrode 41 includes a high-voltage anode output terminal 410 and a high-voltage cathode output terminal 411. In the first embodiment, the first fixed switching electrode 41 includes, as an example, one high-voltage anode output terminal 410 and three high-voltage cathode output terminals 411. The three high-voltage cathode output terminals 411 are the electrode 412 for the large-focus filament, the electrode 413 for the small-focus filament, and the common electrode 414.

[0038] One high-voltage anode output terminal 410 is fixedly positioned so as to be able to contact one rotatable high-voltage anode input terminal 400 in the X1 direction. Each of the three high-voltage cathode output terminals 411 is fixedly positioned so as to be able to contact three rotatable high-voltage cathode input terminals 401 in the X1 direction. The number of first switching fixed electrodes 41 is not particularly limited, as long as it is the same as the number of switching movable electrodes 40.

[0039] As shown in Figure 3, the second switching fixed electrode 42 is configured to electrically connect the second X-ray tube 20 and the transformer 6 by contacting the switching movable electrode 40. As shown in Figure 2, the second switching fixed electrode 42 includes a high-voltage anode output terminal 420 and a high-voltage cathode output terminal 421. In the first embodiment, the second switching fixed electrode 42 includes, as an example, one high-voltage anode output terminal 420 and three high-voltage cathode output terminals 421. The three high-voltage cathode output terminals 421 are the electrode 422 for the large-focus filament, the electrode 423 for the small-focus filament, and the common electrode 424.

[0040] One high-voltage anode output terminal 420 is fixedly positioned so as to be able to contact one rotatable high-voltage anode input terminal 400 in the X2 direction. Three high-voltage cathode output terminals 421 are each fixedly positioned so as to be able to contact three rotatable high-voltage cathode input terminals 401 in the X2 direction. The number of second switching fixed electrodes 42 is not particularly limited, as long as it is the same as the number of switching movable electrodes 40.

[0041] The electrode moving section 50 is configured to move the switching movable electrode 40 by moving the holding member 30 when current is applied. Specifically, the electrode moving section 50 is configured to move the switching movable electrode 40 by moving the second holding member 30b when current is applied, thereby integrally moving the holding member 30, which includes the first holding member 30a, the second holding member 30b, and the switching movable electrode holding member 30c (see Figure 4(b)). As an example, the electrode moving section 50 includes a solenoid 54 having a movable core 52, a coil (not shown) that generates a magnetic force to move the movable core 52, a fixed core (not shown), and a housing section 53. The housing section 53 houses a part of the movable core 52, the coil, and the fixed core. The housing section 53 has an outlet hole 55 through which insulating oil 9 flows out in the direction of movement of the movable core 52 by magnetic force. Furthermore, an outflow obstruction member 56 is provided at a position opposite to the outflow hole 55 of the solenoid 54.

[0042] Specifically, the electrode moving section 50 includes a first solenoid 541, a second solenoid 542, and a connecting support member 51. As shown in Figures 3 and 5(a), the first solenoid 541 is positioned on the X2 side relative to the holding member 30 (second holding member 30b). The first solenoid 541 has a first movable core 521, a first coil (not shown), a first fixed core (not shown), and a first housing section 531. The first solenoid 541 is configured to attract the first movable core 521 in the X2 direction when energized. The first housing section 531 has a first outlet hole 551 formed at its end in the X2 direction through which insulating oil 9 flows out.

[0043] As shown in Figures 3 and 5(b), the second solenoid 542 is positioned on the X1 side relative to the holding member 30 (second holding member 30b). The second solenoid 542 includes a second movable core 522, a second coil (not shown), a second fixed core (not shown), and a second housing 532. The second solenoid 542 is configured to attract the second movable core 522 in the X1 direction when energized. The second housing 532 has a second outlet hole 552 at its X1-direction end through which insulating oil 9 flows out.

[0044] FIG. 6(a) is a schematic front view of the connection support member 51, and FIG. 6(b) is a schematic cross-sectional view taken along line VI-VI of FIG. 6(a). As shown in FIGS. 6(a) and 6(b), the connection support member 51 includes a connection member 510 and a support member 511. The connection member 510 has a plate shape and a through hole 512 is formed therein. The connection member 510 connects the end portion on the X1 direction side of the first movable core 521 and the end portion on the X2 direction side of the second movable core 522. Both end portions of the connection member 510 in the X direction are connected to the first movable core 521 and the second movable core 522 by pins 514, respectively. The support member 511 has a rod shape and passes through the through hole 512 of the connection member 510 and the through hole 31 of the second holding member 30b. The support member 511 supports the end portion of the second holding member 30b in the Z1 direction. The support member 511 is provided with a retaining member 513 for preventing the connection member 510 and the second holding member 30b from coming out of the through holes 512 and 31, respectively.

[0045] The through hole 512 of the connection member 510 is a long hole extending in the Z direction. The support member 511 is inserted into the through hole 512 of the connection member 510 so that the position of the holding member 30 in the Z direction with respect to the connection member 510 can be changed. Also, a gap 515 is formed between the outer surfaces of both end portions of the connection member 510 and the inner surfaces of the first movable core 521 and the second movable core 522 facing the outer surfaces of both end portions of the connection member 510. Therefore, when the connection support member 51 moves in the X2 direction by energizing the first solenoid 541 and the holding member 30 rotates about the fulcrum portion 32, the movement amount of the holding member 30 in the Z direction can be absorbed. Also, when the connection support member 51 moves in the X1 direction by energizing the second solenoid 542 and the holding member 30 rotates about the fulcrum portion 32, the movement amount of the holding member 30 in the Z direction can be absorbed.

[0046] As shown in Fig. 5(a), a first outflow inhibiting member 561 is provided at a position facing the first outflow hole 551 of the first solenoid 541. The first outflow inhibiting member 561 is provided to reduce the moving speed of the first movable iron core 521 of the first solenoid 541 in the X2 direction. The first outflow inhibiting member 561 is configured to inhibit the outflow of the insulating oil 9 from the first outflow hole 551. The first outflow inhibiting member 561 is formed of, for example, a plate-like member. The flat surface of the plate-like member is arranged to face the first outflow hole 551. The area of the flat surface of the plate-like member is larger than the area of the first outflow hole 551.

[0047] Also, as shown in Fig. 5(b), a second outflow inhibiting member 562 is provided at a position facing the second outflow hole 552 of the second solenoid 542. The second outflow inhibiting member 562 is provided to reduce the moving speed of the second movable iron core 522 of the second solenoid 542 in the X1 direction. The second outflow inhibiting member 562 is configured to inhibit the outflow of the insulating oil 9 from the second outflow hole 552. The second outflow inhibiting member 562 is formed of, for example, a plate-like member. The flat surface of the plate-like member is arranged to face the second outflow hole 552. The area of the flat surface of the plate-like member is larger than the area of the second outflow hole 552.

[0048] As shown in Fig. 3, the biasing member 60 is configured to bias the switching movable electrode 40 so as to maintain the first state in which the switching movable electrode 40 and the first switching fixed electrode 41 are in contact, and to maintain the second state in which the switching movable electrode 40 and the second switching fixed electrode 42 are in contact. Specifically, the biasing member 60 biases the switching movable electrode 40 located on the first switching fixed electrode 41 side (X1 direction side) with respect to the fulcrum portion 32 of the holding member 30 toward the first switching fixed electrode 41 side, and biases the switching movable electrode 40 located on the second switching fixed electrode 42 side (second direction side) with respect to the fulcrum portion 32 of the holding member 30 toward the second switching fixed electrode 42 side.

[0049] The biasing member 60 is, for example, a tension spring. The biasing member 60 is provided so as to be suspended inside the housing 8. As shown in Figure 4(b), a first hook portion 61 is provided at the Z1 direction end of the biasing member 60. A second hook portion 62 is provided at the Z2 direction end of the biasing member 60. The first hook portion 61 of the biasing member 60 is connected to a first hook portion connecting member 63 provided on the upper side inside the housing 8. The first hook portion 61 connected inside the housing 8 is located in the Z1 direction more than the fulcrum portion 32 of the holding member 30, and is located approximately directly above the fulcrum portion 32 of the holding member 30 in a front view. The second hook portion 62 of the biasing member 60 is connected to a second hook portion connecting member 64, which is provided on the Z2 direction side of the pivot point portion 32 of the holding member 30, with one end connected to the first holding member 30a and the other end connected to the second holding member 30b.

[0050] As shown in Figure 3, when the Z1 end of the holding member 30 is located on the X2 side relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 is located on the first switching fixed electrode 41 side (X1 side) relative to the pivot point 32, the biasing member 60 biases the Z2 end of the holding member 30 toward the first switching fixed electrode 41. That is, the biasing member 60 biases the switching movable electrode 40 toward the X1 side. Then, when the Z1 end of the holding member 30 rotates from the X2 side to the X1 side relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 rotates from the first switching fixed electrode 41 side (X1 side) toward the second switching fixed electrode 42 side (X2 side) relative to the pivot point 32, the biasing member 60 biases the Z2 end of the holding member 30 toward the second switching fixed electrode 42. In other words, the biasing member 60 biases the switching movable electrode 40 toward the X2 direction.

[0051] Furthermore, when the Z1 end of the holding member 30 is located on the X1 side relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 is located on the second switching fixed electrode 42 side (X2 side) relative to the pivot point 32, the biasing member 60 biases the Z2 end of the holding member 30 toward the second switching fixed electrode 42. That is, the biasing member 60 biases the switching movable electrode 40 toward the X2 side. Then, when the Z1 end of the holding member 30 rotates from the X1 side to the X2 side relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 rotates from the second switching fixed electrode 42 side (X2 side) toward the first switching fixed electrode 41 side (X1 side) relative to the pivot point 32, the biasing member 60 biases the Z2 end of the holding member 30 toward the first switching fixed electrode 41. In other words, the biasing member 60 biases the switching movable electrode 40 toward the X1 direction.

[0052] The current interruption unit 70 is configured to interrupt the current supply to the electrode moving unit 50. The current interruption unit 70 is configured to interrupt the current supply to the electrode moving unit 50 in a first state (see Figure 9(d)) when the switching movable electrode 40, which is biased by the biasing member 60, and the first switching fixed electrode 41 are in contact, and in a second state (see Figure 9(a)) when the switching movable electrode 40, which is biased by the biasing member 60, and the second switching fixed electrode 42 are in contact. The current interruption unit 70 includes a blocking movable electrode 71, a first blocking fixed electrode 72, and a second blocking fixed electrode 73. The current interruption unit 70 is also configured to include a control unit 5.

[0053] The interceptor movable electrode 71 is provided on the holding member 30. The interceptor movable electrode 71 is provided at the Z1 direction end of the holding member 30. Specifically, the interceptor movable electrode 71 is provided at the Z1 direction end of the first holding member 30a (see Figure 4(b)). The interceptor movable electrode 71 moves in conjunction with the rotational movement of the holding member 30.

[0054] Specifically, as shown in Figure 3, when the Z1 end of the holding member 30 rotates from the X1 direction to the X2 direction relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 rotates from the second switching fixed electrode 42 side (X2 direction side) to the first switching fixed electrode 41 side (X1 direction side) relative to the pivot point 32, the blocking movable electrode 71 moves from the X1 direction to the X2 direction relative to the pivot point 32. The blocking movable electrode 71 that has moved from the X1 direction to the X2 direction relative to the pivot point 32 is configured to come into contact with the first blocking fixed electrode 72.

[0055] Furthermore, when the Z1 end of the holding member 30 rotates from the X2 direction to the X1 direction relative to the pivot point 32, and the switching movable electrode 40 of the holding member 30 rotates from the first switching fixed electrode 41 side (X1 direction side) to the second switching fixed electrode 42 side (X2 direction side) relative to the pivot point 32, the blocking movable electrode 71 moves from the X2 direction to the X1 direction relative to the pivot point 32. The blocking movable electrode 71 that has moved from the X2 direction to the X1 direction relative to the pivot point 32 is configured to come into contact with the second blocking fixed electrode 73.

[0056] As shown in Figure 3, the current to the electrode movement section 50 is interrupted when the first interrupting fixed electrode 72 and the interrupting movable electrode 71 come into contact. Specifically, the current to the first solenoid 541 of the electrode movement section 50 is interrupted when the first interrupting fixed electrode 72 and the interrupting movable electrode 71 come into contact. The first interrupting fixed electrode 72 is provided on the X2 direction side of the interrupting movable electrode 71. The first interrupting fixed electrode 72 is positioned so as to be able to come into contact with the interrupting movable electrode 71 before the first state in which the switching movable electrode 40 and the first switching fixed electrode 41 come into contact. The first interrupting fixed electrode 72 is configured to be elastically deformable in the X2 direction.

[0057] When the switching movable electrode 40 rotates relative to the pivot point 32 from the second switching fixed electrode 42 side (X2 direction side) to the first switching fixed electrode 41 side (X1 direction side), the interrupting movable electrode 71 and the first interrupting fixed electrode 72 come into contact before reaching the first state. As a result, the current interruption unit 70 (control unit 5) interrupts the current supply to the first solenoid 541 even before the switching movable electrode 40, which is positioned on the first switching fixed electrode 41 side and biased by the biasing member 60, reaches the first state.

[0058] The system is configured such that the current to the electrode movement section 50 is interrupted when the second interrupting fixed electrode 73 and the interrupting movable electrode 71 come into contact. Specifically, the current to the second solenoid 542 of the electrode movement section 50 is interrupted when the second interrupting fixed electrode 73 and the interrupting movable electrode 71 come into contact. The second interrupting fixed electrode 73 is provided on the X1 direction side of the interrupting movable electrode 71. The second interrupting fixed electrode 73 is positioned so as to be able to come into contact with the interrupting movable electrode 71 before the second state is reached in which the switching movable electrode 40 and the second switching fixed electrode 42 come into contact. The second interrupting fixed electrode 73 is configured to be elastically deformable in the X1 direction.

[0059] When the switching movable electrode 40 rotates relative to the pivot point 32 from the first switching fixed electrode 41 side (X1 direction side) to the second switching fixed electrode 42 side (X2 direction side), the interrupting movable electrode 71 and the second interrupting fixed electrode 73 come into contact before reaching the second state. As a result, the current interruption unit 70 (control unit 5) interrupts the current supply to the second solenoid 542 even before the switching movable electrode 40, which is positioned on the second switching fixed electrode 42 side and biased by the biasing member 60, reaches the second state.

[0060] Figure 7 is a schematic perspective view of the switching unit 7 excluding the housing 8 and insulating oil 9, and Figure 8 is a schematic perspective view of the switching unit 7 excluding the housing 8, insulating oil 9 and high-voltage connector. As shown in Figures 7 and 8, the retaining member 30 includes a resistive member 34. The resistive member 34 is configured to resist the rotational movement of the retaining member 30 due to the viscosity of the insulating oil 9. The resistive member 34 is provided on the switching movable electrode retaining member 30c (see Figure 4(b)). Specifically, the resistive member 34 is provided on the switching movable electrode retaining member 30c of the retaining member 30 along the Y direction between the high-voltage anode input terminal 400 and the high-voltage cathode input terminal 401 of the switching movable electrode 40. The resistive member 34 is provided so as to extend in the Z2 direction beyond the position where the switching movable electrode 40 is provided in the Z direction. The resistive member 34 is formed integrally with the switching movable electrode holding member 30c by molding.

[0061] The resistive member 34 includes a plurality of plate-shaped portions 35. The plurality of plate-shaped portions 35 are provided to increase the surface distance of the resistive member 34 in the Z direction. Each of the plurality of plate-shaped portions 35 has a shape that widens in the Y direction as it moves toward the Z2 direction in a front view. The plurality of plate-shaped portions 35 are arranged side by side, spaced apart from each other, between the high-potential side and the low-potential side. That is, the plurality of plate-shaped portions 35 are arranged side by side in the Y direction, spaced apart from each other, to ensure a sufficient edge discharge distance between the high-voltage anode input terminal 400 and the high-voltage cathode input terminal 401. In addition, ribs are formed on the peripheral edge of each of the plurality of plate-shaped portions 35, projecting in the X1 direction and the X2 direction. In the first embodiment, five plate-shaped portions 35 are arranged on the holding member 30. The number of plurality of plate-shaped portions 35 is not limited to five; it may be two to four or six or more. There may also be just one plate-shaped portion 35.

[0062] (Switching between the first and second X-ray tubes by the switching unit) Referring to Figures 9(a) to 9(d), the switching from the second X-ray tube 20 to the first X-ray tube 10 by the switching unit 7 will be explained.

[0063] In Figure 9(a), the user has selected imaging using the second imaging unit 2. The power output from the transformer 6 is switched to the second X-ray tube 20 by the switching unit 7. The holding member 30 rotates around the pivot point 32 so that the switching movable electrode 40 is positioned on the side of the second switching fixed electrode 42 (X2 direction side). The switching movable electrode 40 and the second switching fixed electrode 42 are in contact. The biasing member 60 biases the switching movable electrode 40 toward the second switching fixed electrode 42 in order to maintain the second state.

[0064] The movable electrode 71 for interruption and the fixed electrode 73 for second interruption are in contact. Due to the contact between the movable electrode 71 and the fixed electrode 73 for second interruption, the current interruption unit 70 (control unit 5) cuts off the current to the second solenoid 542. Although the contact between the movable electrode 71 and the fixed electrode 72 for first interruption has been released, the current interruption unit 70 (control unit 5) cuts off the current to the first solenoid 541.

[0065] In the state shown in Figure 9(a), when the user selects to take an image using the first imaging unit 1 at the operation unit 4, the control unit 5 permits power supply to the first solenoid 541, as shown in Figure 9(b). Power supply to the first solenoid 541 causes the Z1 end of the holding member 30, supported by the connecting support member 51, to move in the X2 direction, and the switching movable electrode 40, provided on the Z2 side of the holding member 30, rotates around the pivot point 32 toward the first switching fixed electrode 41 side (X1 direction side). Contact between the interrupting movable electrode 71 and the elastically deformed first interrupting fixed electrode 72 is released. The power supply interruption unit 70 (control unit 5) remains powered off to the second solenoid 542. Furthermore, contact between the switching movable electrode 40 and the first switching fixed electrode 41 is released.

[0066] While the movable switching electrode 40 is positioned on the side of the second fixed switching electrode 42 (X2 direction side) relative to the pivot point 32 of the holding member 30, the biasing member 60 biases the movable switching electrode 40 toward the second fixed switching electrode 42. However, the force exerted by the first solenoid 541 to move the Z1 end of the holding member 30 toward the X2 direction is greater than the biasing force exerted by the biasing member 60 to bias the movable switching electrode 40 toward the second fixed switching electrode 42. Therefore, while the movable switching electrode 40 is positioned on the side of the second fixed switching electrode 42 (X2 direction side) relative to the pivot point 32 of the holding member 30, the Z1 end of the holding member 30 moves toward the X2 direction, and the movable switching electrode 40 rotates toward the first fixed switching electrode 41 (X1 direction side).

[0067] As shown in Figure 9(c), when the switching movable electrode 40 rotates relative to the pivot point 32 of the holding member 30 from the second switching fixed electrode 42 side (X2 direction side) to the first switching fixed electrode 41 side (X1 direction side), the biasing member 60 biases the switching movable electrode 40, which is located on the first switching fixed electrode 41 side relative to the pivot point 32 of the holding member 30, toward the first switching fixed electrode 41 side. In addition, the blocking movable electrode 71 moves from the X1 direction side to the X2 direction side relative to the pivot point 32.

[0068] Then, before the first state is reached in which the switching movable electrode 40 and the first switching fixed electrode 41 are in contact, the interrupting movable electrode 71 comes into contact with the first interrupting fixed electrode 72. When the interrupting movable electrode 71 and the first interrupting fixed electrode 72 come into contact, the current interruption unit 70 (control unit 5) cuts off the current to the first solenoid 541. In the first solenoid 541, before the second movable iron core 522 and the second fixed iron core come into contact, the current interruption unit 70 (control unit 5) cuts off the current to the first solenoid 541. However, the switching movable electrode 40 is biased toward the first switching fixed electrode 41 by the biasing member 60. Therefore, the switching movable electrode 40 rotates toward the first switching fixed electrode 41 side (X1 direction side) with the pivot point 32 as the pivot point until it reaches the first state due to the biasing force of the biasing member 60.

[0069] Here, the angle θ1 between the straight line extending vertically upward from the pivot point 32 (first pivot point 32a) and the straight line connecting the pivot point 32 (first pivot point 32a) and the contact point of the blocking movable electrode 71 and the first blocking fixed electrode 72 is configured to be smaller than the angle θ2 (see Figure 9(d)) between the straight line extending vertically downward from the pivot point 32 (first pivot point 32a) and the straight line connecting the pivot point 32 (first pivot point 32a) and the contact point of the switching movable electrode 40 and the first switching fixed electrode 41. Therefore, the blocking movable electrode 71 contacts the first blocking fixed electrode 72 before the first state in which the switching movable electrode 40 and the first switching fixed electrode 41 come into contact.

[0070] Then, as shown in Figure 9(d), in the first state in which the switching movable electrode 40 and the first switching fixed electrode 41 are in contact, the biasing member 60 biases the switching movable electrode 40 toward the first switching fixed electrode 41 (towards the X1 direction) to maintain the first state. With this, the switching from the second X-ray tube 20 to the first X-ray tube 10 by the switching unit 7 is completed.

[0071] Next, the switching from the first X-ray tube 10 to the second X-ray tube 20 by the switching unit 7 will be explained in Figures 10(a) to 10(d).

[0072] In Figure 10(a), the user has selected imaging using the first imaging unit 1. The power output from the transformer 6 is switched to the first X-ray tube 10 by the switching unit 7. The holding member 30 rotates around the pivot point 32 so that the switching movable electrode 40 is positioned on the side of the first switching fixed electrode 41 (X1 direction side). The switching movable electrode 40 and the first switching fixed electrode 41 are in contact. The biasing member 60 biases the switching movable electrode 40 toward the first switching fixed electrode 41 in order to maintain the first state.

[0073] The movable electrode 71 for interruption and the fixed electrode 72 for first interruption are in contact. Due to the contact between the movable electrode 71 and the fixed electrode 72 for first interruption, the current interruption unit 70 (control unit 5) cuts off the current to the first solenoid 541. Although the contact between the movable electrode 71 and the fixed electrode 73 for second interruption is released, the current interruption unit 70 (control unit 5) cuts off the current to the second solenoid 542.

[0074] In the state shown in Figure 10(a), when the user selects to take images using the second imaging unit 2 at the operation unit 4, the control unit 5 permits power supply to the second solenoid 542, as shown in Figure 10(b). Power supply to the second solenoid 542 causes the Z1 end of the holding member 30, supported by the connecting support member 51, to move in the X1 direction, while the switching movable electrode 40, provided on the Z2 side of the holding member 30, rotates around the pivot point 32 toward the second switching fixed electrode 42 side (X2 direction side). Contact between the interrupting movable electrode 71 and the elastically deformed second interrupting fixed electrode 73 is released. The power supply interruption unit 70 (control unit 5) remains powered off to the first solenoid 541. Furthermore, contact between the switching movable electrode 40 and the second switching fixed electrode 42 is released.

[0075] While the movable switching electrode 40 is positioned on the side of the first fixed switching electrode 41 (X1 direction side) relative to the pivot point 32 of the holding member 30, the biasing member 60 biases the movable switching electrode 40 toward the first fixed switching electrode 41. However, the force exerted by the second solenoid 542 to move the Z1 end of the holding member 30 toward the X1 direction is greater than the biasing force exerted by the biasing member 60 to bias the movable switching electrode 40 toward the first fixed switching electrode 41. Therefore, while the movable switching electrode 40 is positioned on the side of the first fixed switching electrode 41 (X1 direction side) relative to the pivot point 32 of the holding member 30, the Z1 end of the holding member 30 moves toward the X1 direction, and the movable switching electrode 40 rotates toward the second fixed switching electrode 42 (X2 direction side).

[0076] As shown in Figure 10(c), when the switching movable electrode 40 rotates relative to the pivot point 32 of the holding member 30 from the first switching fixed electrode 41 side (X1 direction side) to the second switching fixed electrode 42 side (X2 direction side), the biasing member 60 biases the switching movable electrode 40, which is located on the second switching fixed electrode 42 side relative to the pivot point 32 of the holding member 30, toward the second switching fixed electrode 42 side. In addition, the blocking movable electrode 71 moves from the X2 direction side to the X1 direction side relative to the pivot point 32.

[0077] Then, before the second state is reached in which the switching movable electrode 40 and the second switching fixed electrode 42 are in contact, the interrupting movable electrode 71 comes into contact with the second interrupting fixed electrode 73. When the interrupting movable electrode 71 and the first interrupting fixed electrode 72 come into contact, the current interruption unit 70 (control unit 5) cuts off the current to the second solenoid 542. In the second solenoid 542, before the first movable core 521 and the first fixed core come into contact, the current interruption unit 70 (control unit 5) cuts off the current to the second solenoid 542. However, the switching movable electrode 40 is biased toward the second switching fixed electrode 42 by the biasing member 60. Therefore, the switching movable electrode 40 rotates toward the second switching fixed electrode 42 side (X2 direction side) with the pivot point 32 as the pivot point until it reaches the second state due to the biasing force of the biasing member 60.

[0078] Here, the angle θ3 between the straight line extending vertically upward from the pivot point 32 (first pivot point 32a) and the straight line connecting the pivot point 32 (first pivot point 32a) and the contact point of the blocking movable electrode 71 and the second blocking fixed electrode 73 is configured to be smaller than the angle θ4 (see Figure 10(d)) between the straight line extending vertically downward from the pivot point 32 (first pivot point 32a) and the straight line connecting the pivot point 32 (first pivot point 32a) and the contact point of the switching movable electrode 40 and the second switching fixed electrode 42. Therefore, the blocking movable electrode 71 contacts the second blocking fixed electrode 73 before the second state in which the switching movable electrode 40 and the second switching fixed electrode 42 come into contact.

[0079] Then, as shown in Figure 10(d), in the second state in which the switching movable electrode 40 and the second switching fixed electrode 42 are in contact, the biasing member 60 biases the switching movable electrode 40 toward the second switching fixed electrode 42 (towards the X2 direction) to maintain the second state. This completes the switching from the first X-ray tube 10 to the second X-ray tube 20 by the switching unit 7.

[0080] (State transitions when switching between the first and second X-ray tubes) Referring to Figure 11, the state transitions when switching between the first X-ray tube 10 and the second X-ray tube 20 by the switching unit 7 will be explained.

[0081] At time t0 (see Figure 9(a)), the user has selected the second imaging unit 2, which includes the second X-ray tube 20. The control unit 5 receives a second X-ray tube selection signal from the operation unit 4. The cutoff movable electrode 71 and the second cutoff fixed electrode 73 are in contact. The control unit 5 receives a second X-ray tube contact signal from the switching unit 7, indicating that the cutoff movable electrode 71 and the second cutoff fixed electrode 73 are connected. The power cutoff unit 70 (control unit 5) cuts off the power supply to the second solenoid 542 under the control of the control unit 5.

[0082] At time t0, the control unit 5 has not received the first X-ray tube selection signal from the operation unit 4. Furthermore, the control unit 5 has not received the first X-ray tube contact signal from the switching unit 7, which indicates that the movable electrode 71 for interruption and the fixed electrode 72 for first interruption are connected. The power interruption unit 70, under the control of the control unit 5, has interrupted the power supply to the first solenoid 541.

[0083] At time t1, the user selects the first imaging unit 1, which includes the first X-ray tube 10. That is, the user selects imaging using the first imaging unit 1 at the operation unit 4. The control unit 5 receives the first X-ray tube selection signal from the operation unit 4. The power cut-off unit 70, under the control of the control unit 5, allows power to be supplied to the first solenoid 541. Since the cut-off movable electrode 71 and the second cut-off fixed electrode 73 are in contact, the control unit 5 receives a second X-ray tube contact signal from the switching unit 7, indicating that the cut-off movable electrode 71 and the second cut-off fixed electrode 73 are connected.

[0084] At time t1, the control unit 5 has not received the second X-ray tube selection signal from the operation unit 4. The control unit 5 has not received the first X-ray tube contact signal from the switching unit 7, which indicates that the movable electrode 71 for interruption and the fixed electrode 72 for first interruption are connected. The power interruption unit 70 has cut off the power supply to the second solenoid 542 under the control of the control unit 5.

[0085] At time t2, the contact between the switching movable electrode 40 and the second switching fixed electrode 42 is released. However, the blocking movable electrode 71 and the second blocking fixed electrode 73 remain in contact.

[0086] At time t3 (see Figure 9(b)), the contact between the movable interruption electrode 71 and the second fixed interruption electrode 73 is released. The control unit 5 does not receive the second X-ray tube contact signal from the switching unit 7, which indicates that the movable interruption electrode 71 and the second fixed interruption electrode 73 are connected.

[0087] At time t4 (see Figure 9(c)), the movable interruption electrode 71 and the first fixed interruption electrode 72 come into contact. The control unit 5 receives a first X-ray tube contact signal from the switching unit 7 indicating that the movable interruption electrode 71 and the first fixed interruption electrode 72 are connected. The current interruption unit 70 also cuts off the current to the first solenoid 541 under the control of the control unit 5. Note that at time t4, the movable switching electrode 40 and the first fixed switching electrode 41 are not in contact.

[0088] At time t5, the first state is reached where the movable switching electrode 40 and the first fixed switching electrode 41 are in contact (see Figures 9(d) and 10(a)). This completes the switching from the second X-ray tube 20 to the first X-ray tube 10 by the switching unit 7.

[0089] Between time t4 and time t11, the current to the first solenoid 541 is cut off, but the switching movable electrode 40 rotates around the pivot point 32 toward the first switching fixed electrode 41 (X1 direction side) due to the biasing force of the biasing member 60 until it reaches the first state. Then, in the first state, the biasing member 60 biases the switching movable electrode 40 toward the first switching fixed electrode 41 (X1 direction side) to maintain the first state.

[0090] At time t11, the user selects the second imaging unit 2, which includes the second X-ray tube 20. That is, the user selects imaging using the second imaging unit 2 at the operation unit 4. The control unit 5 receives the second X-ray tube selection signal from the operation unit 4. The power cut-off unit 70, under the control of the control unit 5, allows power to be supplied to the second solenoid 542. Since the cut-off movable electrode 71 and the first cut-off fixed electrode 72 are in contact, the control unit 5 receives a first X-ray tube contact signal from the switching unit 7 indicating that the cut-off movable electrode 71 and the first cut-off fixed electrode 72 are connected.

[0091] At time t11, the control unit 5 has not received the first X-ray tube selection signal from the operation unit 4. The control unit 5 has not received the second X-ray tube contact signal from the switching unit 7, which indicates that the movable electrode 71 for interruption and the fixed electrode 73 for interruption are connected. The power interruption unit 70 has cut off the power supply to the first solenoid 541 under the control of the control unit 5.

[0092] At time t12, the contact between the switching movable electrode 40 and the first switching fixed electrode 41 is released. However, the blocking movable electrode 71 and the first blocking fixed electrode 72 remain in contact.

[0093] At time t13 (see Figure 10(b)), the contact between the movable interruption electrode 71 and the first fixed interruption electrode 72 is released. The control unit 5 does not receive the first X-ray tube contact signal from the switching unit 7, which indicates that the movable interruption electrode 71 and the first fixed interruption electrode 72 are connected.

[0094] At time t14 (see Figure 10(c)), the movable interruption electrode 71 and the second fixed interruption electrode 73 come into contact. The control unit 5 receives a second X-ray tube contact signal from the switching unit 7 indicating that the movable interruption electrode 71 and the second fixed interruption electrode 73 are connected. The current interruption unit 70 also cuts off the current to the second solenoid 542 under the control of the control unit 5. Note that at time t14, the movable switching electrode 40 and the second fixed switching electrode 42 are not in contact.

[0095] At time t15, the second state is reached where the movable switching electrode 40 and the second fixed switching electrode 42 are in contact (see Figures 10(d) and 9(a)). This completes the switching from the first X-ray tube 10 to the second X-ray tube 20 by the switching unit 7.

[0096] After time t14, the current to the second solenoid 542 is cut off, but the switching movable electrode 40 rotates around the pivot point 32 toward the first switching fixed electrode 41 (X2 direction) due to the biasing force of the biasing member 60 until it reaches the second state. Then, in the second state, the biasing member 60 biases the switching movable electrode 40 toward the second switching fixed electrode 42 (X2 direction) to maintain the second state.

[0097] (Confirmation of the matching state of the selection signal and the contact signal by the control unit) Here, it is difficult for the control unit 5 to determine which of the first imaging unit 1 and the second imaging unit 2 is in an imaging-ready state based solely on which selection signal it has acquired: the first X-ray tube selection signal, which is the selection signal for the first imaging unit 1, or the second X-ray tube selection signal, which is the selection signal for the second imaging unit 2. Therefore, in the first embodiment, the control unit 5 is configured to confirm the matching state of the selection signals for the first imaging unit 1 and the second imaging unit 2, and the contact signal of the cutoff movable electrode 71. Specifically, the control unit 5 is configured to determine which of the first imaging unit 1 and the second imaging unit 2 is in an imaging-ready state based on the selection signals for the first imaging unit 1 and the second imaging unit 2, and the detection state of the first X-ray tube contact signal and the second X-ray tube contact signal. As a result, the control unit 5 can accurately determine which of the first imaging unit 1 and the second imaging unit 2 is in an imaging-ready state.

[0098] Between time t4 and time t11 in Figure 11, the control unit 5 receives a first X-ray tube selection signal from the operation unit 4 and a first X-ray tube contact signal from the switching unit 7, indicating that the movable electrode 71 for blocking and the fixed electrode 72 for blocking are connected. In other words, the control unit 5 receives both the first X-ray tube selection signal and the first X-ray tube contact signal between time t4 and time t11. In this case, as shown in Figure 9(d), the control unit 5 determines that the first imaging unit 1, including the first X-ray tube 10, is in an imaging-ready state.

[0099] Furthermore, from time t14 onwards in Figure 11, the control unit 5 acquires a second X-ray tube selection signal from the operation unit 4 and a second X-ray tube contact signal from the switching unit 7 indicating that the movable electrode 71 for blocking and the fixed electrode 73 for blocking are connected. In other words, from time t14 onwards, the control unit 5 acquires both the second X-ray tube selection signal and the second X-ray tube contact signal. In this case, as shown in Figure 10(d), the control unit 5 determines that the second imaging unit 2, including the second X-ray tube 20, is in an imaging-ready state.

[0100] [Second Embodiment] Next, an X-ray imaging apparatus 100a according to a second embodiment of the present invention will be described with reference to Figures 12 to 17. Unlike the first embodiment described above, in the second embodiment, in the switching section 7a, the holding member 300 has a cylindrical shape and includes a first stopper 81a provided on the first fixed electrode installation member 80a and a second stopper 81b provided on the second fixed electrode installation member 80b, and the switching movable electrode 43 includes a first switching movable electrode 44a and a second switching movable electrode 44b. Note that components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0101] In the examples shown in Figures 12 to 17, as in the examples shown in Figures 3 to 10, the vertical direction is defined as the Z direction, with the upward direction being the Z1 direction and the downward direction being the Z2 direction. Furthermore, two mutually orthogonal directions within a horizontal plane perpendicular to the Z direction are defined as the X direction and the Y direction. Within the X direction, one side is defined as the X1 direction and the other as the X2 direction. Similarly, within the Y direction, one side is defined as the Y1 direction and the other as the Y2 direction.

[0102] (Configuration of the switching section) The switching section 7a in the second embodiment will be described with reference to Figures 12 to 17. As shown in Figure 12, the switching section 7a includes a holding member 300, a movable electrode 43 for switching, a fixed electrode 41 for first switching, a fixed electrode 42 for second switching, an electrode moving section 50 (see Figure 13), a biasing member 60 (see Figure 13), and a current interruption section 70 (see Figure 13). The switching section 7a is housed inside the housing 8. The switching section 7a is arranged inside the housing 8, covered with insulating oil 9. That is, the housing 8 is filled with insulating oil 9, and the switching section 7a is immersed in the insulating oil 9 inside the housing 8. Figure 12 is a schematic diagram of the switching section 7a when imaging by the second imaging section 2 (see Figure 1), which includes the second X-ray tube 20, is selected.

[0103] (Holding Member) As shown in Figure 13, the holding member 300 is configured to hold the switching movable electrode 43. The holding member 300 holds the switching movable electrode 43 at the end in the Z2 direction. The holding member 300 includes a pivot holding portion 301 and a movable electrode holding portion 302. The holding member 300 is made of resin. The pivot holding portion 301 and the movable electrode holding portion 302 are formed by integral molding. Note that the pivot holding portion 301 and the movable electrode holding portion 302 may be formed as separate parts. The holding member 300 is supported by the electrode moving portion 50 at its end in the Z1 direction.

[0104] A pivot point 32 is provided in the pivot point holder 301. The pivot point holder 301 is rotatably supported by the pivot point 32. The pivot point holder 301 is formed to extend in the Z direction. The pivot point holder 301 has a cylindrical shape. Specifically, the pivot point holder 301 has a rectangular cylindrical shape in at least the portion from the pivot point 32 to the end in the Z2 direction. The pivot point 32 is provided on each of the opposing faces in the Y direction of the rectangular cylindrical shape. The pivot point holder 301 has a closed cross-sectional shape in the cross section intersecting the Z direction in at least the portion from the pivot point 32 to the end in the Z2 direction. A biasing member 60 is arranged in the internal space of the cylindrical pivot point holder 301. Note that the Z direction is an example of the "first direction" in the claims.

[0105] Furthermore, the shape of the pivot point holder 301 is not limited to a rectangular tube shape; it is sufficient if the cross-section intersecting the Z-direction has a closed cross-sectional shape. For example, the shape of the pivot point holder 301 may be cylindrical, or it may have a polygonal tube shape other than a rectangular tube shape.

[0106] The movable electrode holder 302 holds the switching movable electrode 43. The movable electrode holder 302 is connected to the Z2 direction end of the pivot holder 301 and is formed to extend in the Y direction intersecting the Z direction. The movable electrode holder 302 is provided with the switching movable electrode 43 (high voltage anode input terminal 400 and high voltage cathode input terminal 401). The movable electrode holder 302 is configured to rotate and move integrally with the pivot holder 301. Note that the Y direction is an example of the "second direction" of the claim.

[0107] The movable electrode holding portion 302 includes a first protrusion 303a protruding in the X1 direction, a second protrusion 303b protruding in the X2 direction (see Figure 12), and a movable electrode placement portion 304.

[0108] Multiple first protrusions 303a are provided. The first protrusions 303a are provided so as to protrude in the X1 direction in order to ensure a sufficient edge discharge distance between the high-voltage anode input terminal 400 and the high-voltage cathode input terminal 401. In the second embodiment, as an example, two first protrusions 303a are provided. Specifically, one first protrusion 303a is provided near the high-voltage anode input terminal 400 and one near the high-voltage cathode input terminal 401. More specifically, the first protrusions 303a are provided near the high-voltage anode input terminal 400 in the Y1 direction and at a position where they can contact one of the first stoppers 81a described later in the first state, and near the high-voltage cathode input terminal 401 in the Y2 direction and at a position where they can contact the other first stopper 81a described later in the first state. The first protrusion 303a may be provided as a single unit, or as a unit of three or more units.

[0109] Multiple second protrusions 303b (see Figure 12) are provided. The second protrusions 303b are provided so as to protrude in the X2 direction in order to ensure a sufficient edge discharge distance between the high-voltage anode input terminal 400 and the high-voltage cathode input terminal 401. In the second embodiment, as an example, two second protrusions 303b are provided. Specifically, one second protrusion 303b is provided near the high-voltage anode input terminal 400 and one near the high-voltage cathode input terminal 401. More specifically, the second protrusions 303b are provided near the high-voltage anode input terminal 400 in the Y1 direction and at a position where they can contact one of the second stoppers 81b described later in the second state, and near the high-voltage cathode input terminal 401 in the Y2 direction and at a position where they can contact the other second stopper 81b described later in the second state. Furthermore, the second protrusion 303b may be provided as a single unit, or as a unit of three or more units.

[0110] A movable electrode 43 for switching is arranged in the movable electrode arrangement section 304. Multiple movable electrodes 43 for switching are arranged in the movable electrode arrangement section 304. As shown in Figure 14, the movable electrode arrangement section 304 includes a first inclined surface 305a and a second inclined surface 305b. Specifically, the movable electrode arrangement section 304 includes a tapered first inclined surface 305a and a second inclined surface 305b having an inclination angle α corresponding to a predetermined angle β, which will be described later. The first inclined surface 305a is provided on the X1 direction side of the movable electrode arrangement section 304. The second inclined surface 305b is provided on the X2 direction side of the movable electrode arrangement section 304. Further details of the movable electrode arrangement section 304 will be described later.

[0111] (Switching movable electrode) As shown in Figure 13, the switching movable electrode 43 is held in the movable electrode holding part 302. The switching movable electrode 43 is configured to be rotatable in conjunction with the rotational movement of the holding member 300, with the pivot point 32 as the pivot point. The switching movable electrode 43 includes a plurality of switching movable electrodes 43. As an example, the switching movable electrode 43 includes one high-voltage anode input terminal 400 and three high-voltage cathode input terminals 401. The number of switching movable electrodes 43 is not particularly limited.

[0112] Each of the multiple switching movable electrodes 43 includes a similar configuration and has a similar external shape. Therefore, an example of a switching movable electrode 43 having a high-voltage anode input terminal 400 will be described with reference to Figure 14. Note that the switching movable electrode 43 having a high-voltage cathode input terminal 401 also includes a similar configuration to the switching movable electrode 43 having a high-voltage anode input terminal 400 and has a similar external shape.

[0113] The switching movable electrode 43 includes, for example, a first switching movable electrode 44a and a second switching movable electrode 44b. The first switching movable electrode 44a and the second switching movable electrode 44b are formed from metal plate-shaped members. The first switching movable electrode 44a and the second switching movable electrode 44b are, as an example, made of phosphor bronze. However, the material of the first switching movable electrode 44a and the second switching movable electrode 44b is not limited to phosphor bronze, and various metal materials can be used.

[0114] The first switching movable electrode 44a is provided along the first inclined surface 305a of the movable electrode arrangement portion 304. The contact portion (contact point 45a) of the first switching movable electrode 44a with the first switching fixed electrode 41 is positioned to protrude from the movable electrode holding portion 302. That is, the contact portion (contact point 45a) of the first switching movable electrode 44a with the first switching fixed electrode 41 is provided in a position that protrudes from the movable electrode arrangement portion 304. The plate-shaped member of the first switching movable electrode 44a has the function of a leaf spring. In the first state in which the first switching movable electrode 44a is in contact with the first switching fixed electrode 41, the contact portion (contact point 45a) of the first switching movable electrode 44a with the first switching fixed electrode 41 is biased toward the first switching fixed electrode 41 by the restoring force of the plate-shaped member.

[0115] Furthermore, the second switching movable electrode 44b is provided along the second inclined surface 305b of the movable electrode arrangement portion 304. The contact portion (contact point 45b) of the second switching movable electrode 44b with the second switching fixed electrode 42 is positioned to protrude from the movable electrode holding portion 302. That is, the contact portion (contact point 45b) of the second switching movable electrode 44b with the second switching fixed electrode 42 is provided in a position that protrudes from the movable electrode arrangement portion 304. The plate-shaped member of the second switching movable electrode 44b has the function of a leaf spring. In the second state in which the second switching movable electrode 44b is in contact with the second switching fixed electrode 42, the contact portion (contact point 45b) of the second switching movable electrode 44b with the second switching fixed electrode 42 is biased toward the second switching fixed electrode 42 by the restoring force of the plate-shaped member.

[0116] The first switching movable electrode 44a and the second switching movable electrode 44b are, for example, attached to the movable electrode arrangement section 304 by screw fastening using the first wedge-shaped member 46a and the second wedge-shaped member 46b. Specifically, the first switching movable electrode 44a is sandwiched between the first inclined surface 305a and the first wedge-shaped member 46a of the movable electrode arrangement section 304, and the second switching movable electrode 44b is sandwiched between the second inclined surface 305b and the second wedge-shaped member 46b of the movable electrode arrangement section 304, and the first wedge-shaped member 46a, the first switching movable electrode 44a, the second wedge-shaped member 46b, and the second switching movable electrode 44b are screw fastened to the movable electrode arrangement section 304.

[0117] The first wedge-shaped member 46a, the second wedge-shaped member 46b, and the screw 47 used for fastening are made of a metal material. The first wedge-shaped member 46a, the second wedge-shaped member 46b, and the screw 47 used for fastening are made of, for example, brass. However, the material of the first wedge-shaped member 46a, the second wedge-shaped member 46b, and the screw 47 used for fastening is not limited to brass, and various metal materials (conductors) can be used. Also, the first wedge-shaped member 46a, the second wedge-shaped member 46b, and the screw 47 used for fastening may be made of different metal materials. That is, the first switching movable electrode 44a, the second switching movable electrode 44b, the first wedge-shaped member 46a, the second wedge-shaped member 46b, and the screw 47 used for fastening are all made of a metal material and are configured as conductive members.

[0118] (Movable electrode arrangement section) The movable electrode arrangement section 304 will be described with reference to Figures 14 and 15. Figure 15(a) is a schematic diagram of the movable electrode arrangement section 304, the switching movable electrode 43, and the first switching fixed electrode 41 when imaging by the first imaging unit 1 (see Figure 1), which includes the first X-ray tube 10, is selected. As shown in Figure 15(a), the holding member 300 is rotated by a predetermined angle β toward the first switching fixed electrode 41 in the first state. That is, in the first state, the holding member 300 is rotated by a predetermined angle β toward the X1 direction with respect to the Z direction.

[0119] Furthermore, Figure 15(b) is a schematic diagram of the movable electrode arrangement section 304, the switching movable electrode 43, and the second switching fixed electrode 42 when imaging by the second imaging section 2 (see Figure 1), which includes the second X-ray tube 20, is selected. As shown in Figure 15(b), in the second state, the holding member 300 is rotated by a predetermined angle β toward the second switching fixed electrode 42. That is, in the second state, the holding member 300 is rotated by a predetermined angle β toward the X2 direction with respect to the Z direction.

[0120] As shown in Figure 14, the first inclined surface 305a of the movable electrode holder 302 has an inclination angle α corresponding to a predetermined angle β. That is, the first inclined surface 305a of the movable electrode holder 302 is inclined by an angle corresponding to the predetermined angle β toward the X1 direction with respect to the direction in which the pivot point holder 301 of the holding member 300 extends. The inclination angle α is the same as the predetermined angle β, or several degrees greater than the predetermined angle β. The first switching movable electrode 44a is provided along the first inclined surface 305a and is provided to protrude from the first inclined surface 305a.

[0121] Furthermore, the second inclined surface 305b of the movable electrode holder 302 has an inclination angle α corresponding to a predetermined angle β. That is, the second inclined surface 305b of the movable electrode holder 302 is inclined by an angle corresponding to the predetermined angle β toward the X2 direction with respect to the direction in which the pivot holder 301 of the holding member 300 extends. The inclination angle α is the same as the predetermined angle β, or several degrees greater than the predetermined angle β. The second switching movable electrode 44b is provided along the second inclined surface 305b and is provided to protrude from the second inclined surface 305b.

[0122] (First switching fixed electrode and second switching fixed electrode) As shown in Figure 12, the first switching fixed electrode 41 is provided on the first fixed electrode installation member 80a. As shown in Figure 16, the first switching fixed electrode 41 includes a high-voltage anode output terminal 410 and a high-voltage cathode output terminal 411. As an example, the first switching fixed electrode 41 includes one high-voltage anode output terminal 410 and three high-voltage cathode output terminals 411. The number of first switching fixed electrodes 41 is not particularly limited, as long as it is the same as the number of switching movable electrodes 43.

[0123] Furthermore, as shown in Figure 12, the second switching fixed electrode 42 is provided on the second fixed electrode installation member 80b. The second switching fixed electrode 42 includes a high-voltage anode output terminal 420 (see Figure 2) and a high-voltage cathode output terminal 421 (see Figure 2). As an example, the second switching fixed electrode 42 includes one high-voltage anode output terminal 420 and three high-voltage cathode output terminals 421. The number of second switching fixed electrodes 42 is not particularly limited, as long as it is the same as the number of switching movable electrodes 43.

[0124] (First Stopper and Second Stopper) As shown in Figures 15(a) and 16, the first fixed electrode mounting member 80a includes a first stopper 81a. That is, the first stopper 81a is provided on the first fixed electrode mounting member 80a. The first stopper 81a contacts the holding member 300 in the first state in which the switching movable electrode 43 and the first switching fixed electrode 41 are in contact. Specifically, in the first state, the first stopper 81a contacts the first protrusion 303a of the movable electrode holding part 302. The first stopper 81a is configured to restrict rotation of each of the plurality of first switching movable electrodes 44a that rotate in conjunction with the rotational movement of the holding member 300 from rotating beyond a predetermined angle β in the X1 direction relative to the Z direction.

[0125] As shown in Figure 16, two first stoppers 81a are provided as an example. Specifically, one first stopper 81a is provided near the high-voltage anode output terminal 410 and one near the high-voltage cathode output terminal 411. More specifically, the first stoppers 81a are provided near the high-voltage anode output terminal 410 in the Y2 direction and at a position where they can contact one of the first protrusions 303a in the first state, and near the high-voltage cathode output terminal 411 in the Y1 direction and at a position where they can contact the other first protrusion 303a in the first state. As an example, the first stopper 81a is provided in a portion of the high-voltage anode output terminal 410 that is within a quarter of the distance from the high-voltage anode output terminal 410 to the high-voltage cathode output terminal 411, and in a portion of the high-voltage cathode output terminal 411 that is within a quarter of the distance from the high-voltage cathode output terminal 411 to the high-voltage anode output terminal 410 to the high-voltage cathode output terminal 411.

[0126] The first stopper 81a may be provided in a portion of the high-voltage anode output terminal 410 that is within one-fifth of the distance between the high-voltage anode output terminal 410 and the high-voltage cathode output terminal 411, and in a portion of the high-voltage cathode output terminal 411 that is within one-fifth of the distance between the high-voltage anode output terminal 410 and the high-voltage cathode output terminal 411, and the position of the first stopper 81a is not particularly limited. The first stopper 81a may also be provided near the high-voltage anode output terminal 410 in the Y1 direction and near the high-voltage cathode output terminal 411 in the Y2 direction. In this case, the first protrusion 303a is provided near the high-voltage anode input terminal 400 in the Y1 direction, and the second protrusion 303b is provided near the high-voltage cathode input terminal 401 in the Y2 direction. Furthermore, only one first stopper 81a may be provided, or three or more may be provided.

[0127] As shown in Figure 17, each of the first stoppers 81a includes an engaging portion 82 and an engaged member 85. The engaging portion 82 includes a pair of projections 83 that protrude from the first fixed electrode mounting member 80a in the X2 direction, and ribs 84 provided at the tip of each of the pair of projections 83. The pair of projections 83 are arranged to be aligned in the Y direction on the first fixed electrode mounting member 80a. The ribs 84 are formed to extend away from each other in the Y direction from the tips of the pair of projections 83.

[0128] The engaged member 85 is provided so as to engage with the engaging portion 82. The engaged member 85 is, for example, an annular elastic member. The engaged member 85 is, as an example, an O-ring. The inner circumference of the engaged member 85 is engaged with the engaging portion 82. The engaged member 85 is positioned in contact with the rib 84 of the engaging portion 82, thereby preventing it from detaching from the engaging portion 82.

[0129] As shown in Figures 15(a), 17(a), and 17(b), in the first state, the first projection 303a of the movable electrode holder 302 is positioned between a pair of opposing projections 83, and the first projection 303a contacts the engaged member 85, which is positioned on the side of one projection 83 to the other projection 83, and on the side of the other projection 83 to the first projection 83, thereby restricting the rotation of the first switching movable electrode 44a beyond a predetermined angle β in the X1 direction. Furthermore, since the engaged member 85 is formed of an elastic material, it is formed as a buffer member to absorb the impact when the first stopper 81a collides with the first projection 303a of the movable electrode holder 302. That is, the first stopper 81a includes the engaged member 85 as a buffer member to absorb the impact when the first stopper 81a collides with the holder 300.

[0130] As shown in Figure 15(b), the second fixed electrode mounting member 80b includes a second stopper 81b. That is, the second stopper 81b is provided on the second fixed electrode mounting member 80b. The second stopper 81b contacts the holding member 300 in the second state in which the switching movable electrode 43 and the second switching fixed electrode 42 are in contact. Specifically, in the second state, the second stopper 81b contacts the second protrusion 303b of the movable electrode holding portion 302. The second stopper 81b is configured to restrict rotation of each of the multiple second switching movable electrodes 44b, which rotate in conjunction with the rotational movement of the holding member 300, from exceeding a predetermined angle β in the X2 direction relative to the Z direction.

[0131] Although not shown in the figures, as an example, two second stoppers 81b are provided, similar to the first stopper 81a. Specifically, one second stopper 81b is provided near the high-voltage anode output terminal 420 and one near the high-voltage cathode output terminal 421. More specifically, the second stoppers 81b are provided near the high-voltage anode output terminal 420 in the Y2 direction and at a position where they can contact one of the second protrusions 303b in the second state, and near the high-voltage cathode output terminal 421 in the Y1 direction and at a position where they can contact the other second protrusion 303b in the second state. As an example, the second stopper 81b is provided in a portion of the high-voltage anode output terminal 420 that is within a quarter of the distance from the high-voltage anode output terminal 420 to the high-voltage cathode output terminal 421, and in a portion of the high-voltage cathode output terminal 421 that is within a quarter of the distance from the high-voltage cathode output terminal 421 to the high-voltage anode output terminal 420 to the high-voltage cathode output terminal 421. The position of the second stopper 81b is not particularly limited.

[0132] The position of the second stopper 81b is not particularly limited, similar to the position of the first stopper 81a. Furthermore, the second stopper 81b may be provided near the high-voltage anode output terminal 420 in the Y1 direction and near the high-voltage cathode output terminal 421 in the Y2 direction. In this case, the second protrusion 303b is provided near the high-voltage anode input terminal 400 in the Y1 direction, and the second protrusion 303b is provided near the high-voltage cathode input terminal 401 in the Y2 direction. Also, only one second stopper 81b may be provided, or three or more may be provided.

[0133] Since the configuration of each part of the second stopper 81b is the same as that of the first stopper 81a, a detailed explanation is omitted here.

[0134] In the second state, as in the first state, the second projection 303b contacts the engaged member 85, thereby restricting the rotation of the second switching movable electrode 44b beyond a predetermined angle β in the X2 direction. Furthermore, since the engaged member 85 is formed of an elastic material, it is formed with a cushioning member to absorb the impact when the second stopper 81b collides with the second projection 303b of the movable electrode holding portion 302. In other words, the second stopper 81b includes the engaged member 85 as a cushioning member to absorb the impact when the second stopper 81b collides with the holding member 300.

[0135] Furthermore, in the first stopper 81a and the second stopper 81b, the engaged member 85 is not limited to an annular elastic member such as an O-ring. That is, the first stopper 81a, which includes the engaging portion 82 and the engaged member 85, is not particularly limited in material, shape, and structure, as long as it can restrict rotation of the first switching movable electrode 44a beyond a predetermined angle β in the X1 direction with respect to the Z direction. Also, the first stopper 81a may be configured without a buffer member to cushion the impact when the first stopper 81a collides with the holding member 300, while the first protrusion 303a of the movable electrode holding portion 302 may be configured to include a buffer member to cushion the impact when the first stopper 81a collides with the holding member 300.

[0136] Furthermore, the second stopper 81b, which includes the engaging portion 82 and the engaged member 85, is not particularly limited in material, shape, and structure, as long as it can restrict rotation of the second switching movable electrode 44b beyond a predetermined angle β in the X2 direction relative to the Z direction. Also, the second stopper 81b may be configured without a buffer member for cushioning the impact when the second stopper 81b collides with the holding member 300, while the second protrusion 303b of the movable electrode holding portion 302 may be configured to include a buffer member for cushioning the impact when the second stopper 81b collides with the holding member 300.

[0137] The other configurations of the second embodiment are the same as those of the first embodiment described above.

[0138] [Variations] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and further includes all modifications (variations) within the meaning and scope equivalent to the claims. For example, in the first and second embodiments, the switching unit (switching device) may be provided in an apparatus other than an X-ray imaging apparatus. Also, the switching unit (switching device) may be provided in an apparatus other than a high-voltage generator including a transformer. Also, the switching unit (switching device) may be provided in an apparatus that converts DC power to AC power. As an example, the switching unit (switching device) may be provided in a plasma generator. The apparatus in which the switching unit (switching device) is provided is not particularly limited and can be applied to a variety of apparatuses. Furthermore, for example, in the first and second embodiments, the biasing member may be configured to maintain the first state when the movable switching electrode and the first fixed switching electrode come into contact, without biasing the movable switching electrode located on the first fixed switching electrode side relative to the pivot point towards the first fixed switching electrode before entering the first state. Furthermore, for example, the biasing member may be configured to maintain the second state when the movable switching electrode and the second fixed switching electrode come into contact, without biasing the movable switching electrode located on the second fixed switching electrode side relative to the pivot point towards the second fixed switching electrode before entering the second state. Furthermore, for example, in the first and second embodiments, the current interruption unit may be configured to not interrupt the current supply to the electrode moving unit before entering the first state, but to interrupt the current supply to the electrode moving unit when entering the first state. Furthermore, for example, the current interruption unit may be configured to not interrupt the current supply to the electrode moving unit before entering the second state, but to interrupt the current supply to the electrode moving unit when entering the second state. Furthermore, for example, in the first and second embodiments, the current interruption unit may be configured not to include a control unit. The current interruption unit may be configured to mechanically interrupt the current supply to the electrode moving part based on contact between the interruption movable electrode and the first interruption movable electrode or the second interruption movable electrode, rather than being controlled by a control unit.Furthermore, for example, in the first and second embodiments, the holding member may be configured to hold the switching movable electrode on one end in the Y direction, be supported by the electrode moving part on the other end in the Y direction, and be supported by a pivot part so as to be rotatable in the X direction in a horizontal plane. Also, for example, in the first and second embodiments, the holding member may be configured to be supported so as to be slidable in the X direction. Also, for example, in the first and second embodiments, the holding member may not include a resistive member. Also, for example, in the first and second embodiments, the electrode moving part may include other known moving mechanisms without including the first solenoid and the second solenoid, and the switching movable electrode may be moved by moving the holding member with the other known moving mechanism. Also, for example, in the first and second embodiments, the outflow of insulating oil from the first and second outflow holes may be prevented by adjusting the diameter of the first and second outflow holes, without providing an outflow inhibiting member. Furthermore, for example, in the first and second embodiments, the biasing member may be composed of a torsion spring or a coil spring. Also, for example, in the second embodiment, the pivot point holder does not have to have a cylindrical shape. For example, the pivot point holder may have an open cross-sectional shape. Also, the pivot point holder may have a cylindrical shape in a portion from the pivot point to the end in the Z2 direction. Also, for example, in the second embodiment, the first fixed electrode installation member does not have to include a first stopper, and the second fixed electrode installation member does not have to include a second stopper. Also, for example, in the second embodiment, both the first stopper and the second stopper and the holder member do not have to include a buffer member. Furthermore, for example, in the second embodiment, the movable electrode holding portion does not have to include tapered first and second inclined surfaces having inclination angles corresponding to a predetermined angle, and the switching movable electrode does not have to include a first switching movable electrode provided along the first inclined surface and a second switching movable electrode provided along the second inclined surface.Furthermore, for example, in the second embodiment, the first switching movable electrode and the second switching movable electrode may be attached to the movable electrode arrangement portion without using the first wedge-shaped member and the second wedge-shaped member.

[0139] [Embodiments] The exemplary embodiments described above will be understood by those skilled in the art to be specific examples of the following embodiments.

[0140] (Item 1) An X-ray imaging apparatus comprising: a first imaging unit including a first X-ray tube; a second imaging unit including a second X-ray tube; and a switching unit for switching the output destination of power between the first X-ray tube and the second X-ray tube, wherein the switching unit includes: a holding member for holding a switching movable electrode; an electrode moving unit for moving the holding member by energizing; a first switching fixed electrode for electrically connecting the first X-ray tube and a power supply by contacting the switching movable electrode; a second switching fixed electrode for electrically connecting the second X-ray tube and a power supply by contacting the switching movable electrode; and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintaining a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is cut off in the first state and the second state. The biasing member maintains a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and also maintains a second state in which the switching movable electrode and the second switching fixed electrode are in contact. That is, in both the first and second states, the biasing member can maintain the first and second states without continuously supplying power to the electrode moving part. Therefore, the power supply to the electrode moving part can be cut off in the first and second states. As a result, power saving in maintaining the switched state of the first X-ray tube and the second X-ray tube in the switching part can be achieved. (Item 2) The X-ray imaging apparatus according to Item 1, wherein the holding member is supported so as to be rotatable by a pivot point, and the biasing member biases the switching movable electrode located on the first switching fixed electrode side with respect to the pivot point toward the first switching fixed electrode, and biases the switching movable electrode located on the second switching fixed electrode side with respect to the pivot point toward the second switching fixed electrode. In this case, the biasing member can bias the movable switching electrode, which is located on the first fixed switching electrode side relative to the pivot point, toward the first fixed switching electrode by the rotating holding member, and the movable switching electrode, which is located on the second fixed switching electrode side relative to the pivot point, toward the second fixed switching electrode by the rotating holding member.Therefore, even if the current to the electrode moving part is cut off before the first and second states are reached, the biasing member can bring the device into the first and second states. As a result, power saving for maintaining the state in which the first X-ray tube and the second X-ray tube are switched in the switching part can be further reduced. (Item 3) The switching part further includes a power cutting part that cuts off the current to the electrode moving part, and the power cutting part cuts off the current to the electrode moving part in the first state in which the switching movable electrode biased by the biasing member and the first switching fixed electrode are in contact, and in the second state in which the switching movable electrode biased by the biasing member and the second switching fixed electrode are in contact, as described in Item 1 or 2. In this case, since the power cutting part can cut off the current to the electrode moving part in the first state and the second state, power saving for maintaining the state in which the first X-ray tube and the second X-ray tube are switched in the switching part can be easily reduced. (Item 4) The X-ray imaging apparatus according to Item 3, wherein the biasing member biases the movable switching electrode located on the first fixed switching electrode side toward the first fixed switching electrode side, and the movable switching electrode located on the second fixed switching electrode side toward the second fixed switching electrode side, and the current cutoff section cuts off the current to the electrode moving section before the movable switching electrode located on the first fixed switching electrode side and biased by the biasing member reaches the first state, and cuts off the current to the electrode moving section before the movable switching electrode located on the second fixed switching electrode side and biased by the biasing member reaches the second state. In this case, the biasing member can bias the movable switching electrode located on the first fixed switching electrode side with respect to the pivot point toward the first fixed switching electrode side, and the rotating holding member can bias the movable switching electrode located on the second fixed switching electrode side with respect to the pivot point toward the second fixed switching electrode side. Therefore, since the current supply to the electrode moving part can be cut off by the current cutoff part before the first and second states are reached, the movement speed of the holding member can be reduced before the first and second states are reached. As a result, the collision noise when the switching movable electrode comes into contact with the first switching fixed electrode and the second switching fixed electrode can be reduced.Therefore, the quietness during switching between the first X-ray tube and the second X-ray tube can be improved. (Item 5) The X-ray imaging apparatus according to Item 3 or 4, wherein the current interruption section includes a movable electrode for interruption provided on the holding member and moving with the movement of the holding member, a first fixed electrode for interruption which interrupts the supply of current to the electrode moving section by contacting the movable electrode for interruption, and a second fixed electrode for interruption which interrupts the supply of current to the electrode moving section by contacting the movable electrode for interruption. In this case, since the current interruption section includes a movable electrode for interruption, a first fixed electrode for interruption which interrupts the supply of current to the electrode moving section by contacting the movable electrode for interruption, and a second fixed electrode for interruption which interrupts the supply of current to the electrode moving section by contacting the movable electrode for interruption, the supply of current to the electrode moving section can be easily interrupted. (Item 6) The X-ray imaging apparatus according to Item 5, wherein the holding member is supported so as to be rotatable by a pivot point, and the current interruption part is configured such that when the switching movable electrode rotates relative to the pivot point from the second fixed switching electrode side to the first fixed switching electrode side, the interruption movable electrode and the first fixed interruption electrode come into contact before reaching the first state, and when the switching movable electrode rotates relative to the pivot point from the first fixed switching electrode side to the second fixed switching electrode side, the interruption movable electrode and the second fixed interruption electrode come into contact before reaching the second state. In this case, during the rotational movement of the switching movable electrode, the interruption movable electrode and the first fixed interruption electrode can be brought into contact before the switching movable electrode and the first fixed switching electrode come into contact, and the interruption movable electrode and the second fixed interruption electrode can be brought into contact before the switching movable electrode and the second fixed switching electrode come into contact. Therefore, the current to the electrode moving part can be reliably cut off before the first state is reached, and the current to the electrode moving part can be reliably cut off before the second state is reached, so the rotational movement speed of the holding member can be reliably reduced before the first and second states are reached. As a result, the collision noise when the switching movable electrode comes into contact with the first switching fixed electrode and the second switching fixed electrode can be reliably reduced.(Item 7) The X-ray imaging apparatus according to any one of Items 1 to 6, wherein the switching section is covered with insulating oil, the holding member extends beyond the position where the switching movable electrode is provided, and includes a resistance member that resists the movement of the holding member due to the viscosity of the insulating oil. In this case, when the holding member that holds the switching movable electrode is moved by the electrode moving section, the resistance member resists due to the viscosity of the insulating oil, thereby reducing the speed at which the holding member moves. Therefore, the collision noise when the switching movable electrode comes into contact with the first switching fixed electrode and the second switching fixed electrode can be effectively reduced. As a result, the quietness during switching between the first X-ray tube and the second X-ray tube can be effectively improved. (Item 8) The X-ray imaging apparatus according to Item 7, wherein the resistance member includes a plurality of plate-shaped parts arranged side by side spaced apart from each other between the high potential side and the low potential side. In this case, the multiple plate-like portions are arranged side by side spaced apart from each other between the high-potential side and the low-potential side, so that the surface distance between the high-potential side and the low-potential side of the resistive member can be increased. Therefore, a sufficient edge discharge distance can be secured between the high-potential side and the low-potential side, so that a short circuit between the high-potential side and the low-potential side can be suppressed. (Item 9) The switching portion is arranged covered with insulating oil, the electrode moving portion includes a movable iron core and a coil that generates a magnetic force to move the movable iron core, and includes a solenoid in which an outflow hole is formed through which the insulating oil flows out in the direction of movement of the movable iron core by the magnetic force, and further comprises an outflow inhibiting member provided at a position opposite to the outflow hole of the solenoid to inhibit the outflow of the insulating oil from the outflow hole. This is an X-ray imaging apparatus according to any one of items 1 to 8. In this case, when the movable iron core of the solenoid moves toward the fixed iron core by the magnetic force, the outflow inhibiting member inhibits the outflow of insulating oil from the outflow hole, thereby reducing the moving speed of the movable iron core. Therefore, by reducing the movement speed of the movable core, the collision noise when the movable core collides with the fixed core can be effectively reduced. As a result, the quietness during switching between the first and second X-ray tubes can be effectively improved.(Item 10) The X-ray imaging apparatus according to any one of Items 1 to 9, wherein the holding member is supported so as to be rotatable by a pivot point and includes a pivot point holding portion extending in a first direction and provided with the pivot point, and a movable electrode holding portion connected to one end of the pivot point holding portion and extending in a second direction intersecting the first direction and provided with the switching movable electrode, wherein the pivot point holding portion has a cylindrical shape. In this case, by making the shape of the pivot point holding portion that is rotatable by the pivot point a cylindrical shape, the mechanical strength in the second and third directions intersecting the first direction can be improved. This makes it possible to increase the torsional rigidity of the pivot point holding portion. As a result, twisting of the pivot point holding portion caused by the non-uniform force acting on the movable electrode holding portion provided with the switching movable electrode that rotates integrally with the pivot point holding portion can be suppressed. As a result, the contact pressure of the contacts of the switching movable electrode provided in the movable electrode holding portion with respect to the first switching fixed electrode and the second switching fixed electrode can be made equal. (Item 11) An X-ray imaging apparatus according to any one of items 1 to 10, further comprising a first fixed electrode mounting member provided with the first switching fixed electrode, and a second fixed electrode mounting member provided with the second switching fixed electrode, wherein the first fixed electrode mounting member includes a first stopper that contacts the holding member in the first state in which the switching movable electrode and the first switching fixed electrode are in contact, and the second fixed electrode mounting member includes a second stopper that contacts the holding member in the second state in which the switching movable electrode and the second switching fixed electrode are in contact. In this case, since the first stopper and the holding member are in contact in the first state, and the second stopper and the holding member are in contact in the second state, twisting of the fulcrum holding portion in the first and second states can be further suppressed. As a result, the contact pressure of the switching movable electrode provided in the movable electrode holding portion with respect to the first switching fixed electrode and the second switching fixed electrode can be made more equal. (Item 12) The X-ray imaging apparatus according to Item 11, wherein one of the first stopper and the second stopper and the holding member includes a cushioning member for cushioning the impact when the first stopper and the second stopper collide with the holding member.In this case, the cushioning member can absorb the impact when the first stopper and the second stopper collide with the holding member, thereby suppressing the rebound movement of the holding member caused by contact between the first stopper and the second stopper and the holding member. As a result, the movable switching electrode can be properly brought into contact with the first and second fixed switching electrodes. (Item 13) The X-ray imaging apparatus according to any one of items 1 to 12, wherein the switching movable electrode includes a plurality of the switching movable electrodes, the holding member is supported so as to be rotatable by a pivot point and includes a pivot point holding part on which the pivot point is provided, and a movable electrode holding part connected to one end of the pivot point holding part and on which a plurality of the switching movable electrodes are provided, the holding member is in a state in which it is rotated by a predetermined angle toward the first switching fixed electrode in the first state, and in a state in which it is rotated by the predetermined angle toward the second switching fixed electrode in the second state, the movable electrode holding part includes a tapered first inclined surface and a second inclined surface having an inclination angle corresponding to the predetermined angle, and each of the plurality of the switching movable electrodes includes a first switching movable electrode provided along the first inclined surface and a second switching movable electrode provided along the second inclined surface. In this case, since the plurality of first switching movable electrodes in the plurality of switching movable electrodes are provided along the first inclined surface, the positions of the contacts of the plurality of first switching movable electrodes can be aligned. Furthermore, since the multiple second movable electrodes in the multiple movable switching electrodes are provided along the second inclined surface, the contact positions of the multiple second movable switching electrodes can be aligned. As a result, the multiple first movable switching electrodes can be properly brought into contact with the first fixed switching electrode, and the multiple second movable switching electrodes can be properly brought into contact with the second fixed switching electrode.(Item 14) A high-voltage generator comprising: a transformer that increases the voltage of input power and outputs the increased power to either a first device or a second device; and a switching unit that switches the output destination of the power output from the transformer between the first device and the second device, wherein the switching unit includes: a holding member that holds a switching movable electrode; an electrode moving unit that moves the switching movable electrode by moving the holding member when energized; a first switching fixed electrode that electrically connects the first device and the transformer by contacting the switching movable electrode; a second switching fixed electrode that electrically connects the first device and the transformer by contacting the switching movable electrode; and a biasing member that biases the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintains a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is cut off in the first state and the second state. The biasing member maintains a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and also maintains a second state in which the switching movable electrode and the second switching fixed electrode are in contact. In other words, in both the first and second states, the biasing member can maintain the first and second states without continuously supplying power to the electrode moving part. Therefore, the power supply to the electrode moving part can be cut off in the first and second states. As a result, power consumption required to maintain the switched state of the equipment in the switching part can be reduced.(Item 15) A switching device for switching the output destination of input power between a first device and a second device, comprising: a holding member for holding a switching movable electrode; an electrode moving part for moving the holding member by energizing; a first switching fixed electrode for electrically connecting the first device and a power supply by contacting the switching movable electrode; a second switching fixed electrode for electrically connecting the first device and a power supply by contacting the switching movable electrode; and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and configured such that the energization to the electrode moving part is interrupted in the first and second states. The biasing member maintains the first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintains the second state in which the switching movable electrode and the second switching fixed electrode are in contact. In other words, in both the first and second states, the biasing member can maintain the first and second states without continuously supplying current to the electrode moving part. Therefore, the current supply to the electrode moving part can be cut off in both the first and second states. As a result, power consumption required to maintain the switched state of the equipment in the switching device can be reduced.

[0141] 1 First imaging unit 2 Second imaging unit 3 High voltage generator 6 Transformer 7, 7a Switching unit (switching device) 9 Insulating oil 10 First X-ray tube (first equipment) 20 Second X-ray tube (second equipment) 30, 300 Holding member 32 Pivot part 34 Resistive member 35 Plate-shaped part 40, 43 Movable electrode for switching 41 First fixed electrode for switching 42 Second fixed electrode for switching 44a First movable electrode for switching 44b Second movable electrode for switching 50 Electrode moving part 52 Movable iron core 54 Solenoid 55 Outlet hole 56 Outlet obstructing member 60 Biasing member 70 Current interruption part 71 Interrupting movable electrode 72 First fixed electrode for interruption 73 Second fixed electrode for interruption 80a First fixed electrode installation member 80b Second fixed electrode installation member 81a First stopper 81b Second stopper 100, 100a X-ray imaging apparatus 301 Pivot holding part 302 Movable electrode holding part 305a First inclined surface 305b Second inclined surface α Inclination angle β Determined angle

Claims

1. An X-ray imaging apparatus comprising: a first imaging unit including a first X-ray tube; a second imaging unit including a second X-ray tube; and a switching unit for switching the power output destination between the first X-ray tube and the second X-ray tube, wherein the switching unit includes: a holding member for holding a switching movable electrode; an electrode moving unit for moving the holding member by energizing it, thereby moving the switching movable electrode; a first switching fixed electrode for electrically connecting the first X-ray tube and a power supply by contacting the switching movable electrode; a second switching fixed electrode for electrically connecting the second X-ray tube and a power supply by contacting the switching movable electrode; and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintaining a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is interrupted in the first and second states.

2. The X-ray imaging apparatus according to claim 1, wherein the holding member is supported so as to be rotatable by a pivot point, and the biasing member biases the movable switching electrode located on the first fixed switching electrode side with respect to the pivot point toward the first fixed switching electrode, and biases the movable switching electrode located on the second fixed switching electrode side with respect to the pivot point toward the second fixed switching electrode.

3. The X-ray imaging apparatus according to claim 1, wherein the switching unit further includes a power supply interruption unit that interrupts the supply of power to the electrode moving unit, the power supply interruption unit interrupts the supply of power to the electrode moving unit in a first state in which the switching movable electrode biased by the biasing member and the first switching fixed electrode are in contact, and in a second state in which the switching movable electrode biased by the biasing member and the second switching fixed electrode are in contact.

4. The X-ray imaging apparatus according to claim 3, wherein the biasing member biases the movable switching electrode located on the first fixed switching electrode side toward the first fixed switching electrode, and biases the movable switching electrode located on the second fixed switching electrode side toward the second fixed switching electrode, and the current cutoff section cuts off the current to the electrode moving section before the movable switching electrode located on the first fixed switching electrode side and biased by the biasing member reaches the first state, and cuts off the current to the electrode moving section before the movable switching electrode located on the second fixed switching electrode side and biased by the biasing member reaches the second state.

5. The X-ray imaging apparatus according to claim 3, wherein the current interruption section includes a movable electrode for interruption provided on the holding member and moving in conjunction with the movement of the holding member; a first fixed electrode for interruption that interrupts the current supply to the electrode moving section by contacting the movable electrode for interruption; and a second fixed electrode for interruption that interrupts the current supply to the electrode moving section by contacting the movable electrode for interruption.

6. The X-ray imaging apparatus according to claim 5, wherein the holding member is supported so as to be rotatable by a pivot point, and the current interruption part is configured such that when the switching movable electrode rotates relative to the pivot point from the second switching fixed electrode side to the first switching fixed electrode side, the interruption movable electrode and the first interruption fixed electrode come into contact before reaching the first state, and when the switching movable electrode rotates relative to the pivot point from the first switching fixed electrode side to the second switching fixed electrode side, the interruption movable electrode and the second interruption fixed electrode come into contact before reaching the second state.

7. The X-ray imaging apparatus according to claim 1, wherein the switching section is covered with insulating oil, the holding member extends beyond the position where the switching movable electrode is provided, and includes a resistive member that resists the movement of the holding member due to the viscosity of the insulating oil.

8. The X-ray imaging apparatus according to claim 7, wherein the resistive member includes a plurality of plate-shaped portions arranged side by side at a distance from each other between the high-potential side and the low-potential side.

9. The X-ray imaging apparatus according to claim 1, wherein the switching section is arranged covered with insulating oil, the electrode moving section includes a movable iron core and a coil that generates a magnetic force to move the movable iron core, and includes a solenoid in which an outlet hole is formed through which the insulating oil flows out in the direction of movement of the movable iron core by the magnetic force, and further comprises an outlet inhibiting member provided at a position opposite to the outlet hole of the solenoid to inhibit the outflow of the insulating oil from the outlet hole.

10. The X-ray imaging apparatus according to claim 1, wherein the holding member is supported so as to be rotatable by a pivot point and includes a pivot point holding portion extending in a first direction and provided with the pivot point, and a movable electrode holding portion connected to one end of the pivot point holding portion and extending in a second direction intersecting the first direction and provided with the switching movable electrode, the pivot point holding portion having a cylindrical shape.

11. The X-ray imaging apparatus according to claim 1, further comprising a first fixed electrode mounting member provided with the first switching fixed electrode, and a second fixed electrode mounting member provided with the second switching fixed electrode, wherein the first fixed electrode mounting member includes a first stopper that contacts the holding member in the first state in which the switching movable electrode and the first switching fixed electrode are in contact, and the second fixed electrode mounting member includes a second stopper that contacts the holding member in the second state in which the switching movable electrode and the second switching fixed electrode are in contact.

12. The X-ray imaging apparatus according to claim 11, wherein one of the first stopper and the second stopper and the holding member includes a cushioning member for cushioning the impact when the first stopper and the second stopper collide with the holding member.

13. The X-ray imaging apparatus according to claim 1, wherein the switching movable electrode includes a plurality of the switching movable electrodes, the holding member is supported so as to be rotatable by a pivot point and includes a pivot point holding part on which the pivot point is provided and a movable electrode holding part connected to one end of the pivot point holding part and on which a plurality of the switching movable electrodes are provided, the holding member is in a state in which it is rotated by a predetermined angle toward the first switching fixed electrode in the first state and in a state in which it is rotated by the predetermined angle toward the second switching fixed electrode in the second state, the movable electrode holding part includes a tapered first inclined surface and a second inclined surface having an inclination angle corresponding to the predetermined angle, and each of the plurality of the switching movable electrodes includes a first switching movable electrode provided along the first inclined surface and a second switching movable electrode provided along the second inclined surface.

14. A high-voltage generator comprising: a transformer that increases the voltage of input power and outputs the increased power to either a first device or a second device; and a switching unit that switches the output destination of the power output from the transformer between the first device and the second device, wherein the switching unit includes: a holding member that holds a switching movable electrode; an electrode moving unit that moves the switching movable electrode by moving the holding member when energized; a first switching fixed electrode that electrically connects the first device and the transformer by contacting the switching movable electrode; a second switching fixed electrode that electrically connects the second device and the transformer by contacting the switching movable electrode; and a biasing member that biases the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintains a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the power supply to the electrode moving unit is cut off in the first state and the second state.

15. A switching device for switching the output destination of input power between a first device and a second device, comprising: a holding member for holding a switching movable electrode; an electrode moving part for moving the switching movable electrode by moving the holding member when current is applied; a first switching fixed electrode for electrically connecting the first device and a power supply by contacting the switching movable electrode; a second switching fixed electrode for electrically connecting the second device and a power supply by contacting the switching movable electrode; and a biasing member for biasing the switching movable electrode to maintain a first state in which the switching movable electrode and the first switching fixed electrode are in contact, and maintaining a second state in which the switching movable electrode and the second switching fixed electrode are in contact, wherein the switching device is configured such that current is cut off to the electrode moving part in the first state and the second state.

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